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UPDATE: Details on how bombs were constructed

by KJCE Staff,posted Apr 16 2013 10:59AM

A law enforcement source tells CBS News one of the explosive devices--the one found near the Starbucks--appears to have been placed in a metal pressure cooker (a metal kitchen pot with a locked down top) which had been placed in a black nylon bag or backpack. Investigators also found pieces of an electronic circuit board possibly indicating a timer was used in the detonation of the bomb.

Both explosive devices consisted of low order explosive (where you get the big boom and some damage but not the high pressure waves which would create a crater and blowout out windows.) and nails and ball bearings.